Тарас Кирилюк — docker basics. how-to for drupal developers
TRANSCRIPT
Docker basics.How-to For Drupal devs
Hi @here!I am Taras KyryliukI am here because I have been
using Docker for almost a Year and
have something to say about it
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Disclaimer: I am a Drupal developer and automation maniac
Overview
▹ Software isolation
▹ Introducing Docker
▹ Docker in Drupal development
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1.Software isolation
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Why we need Software Isolation?
Starting from the assumption that software will always have bugs, we need a way to isolate and neutralize the effects of the bugs…
© internet
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6 Virtualization
Operating system-level
Containers
OpenVZ, Solaris Zones, lxc, libcontainer
Hardware-level
Virtual machines
KVM, Xen, VMware, VirtualBox, xhyve
Operating system-level virtualization - Containerisation
▹ Limited overhead▹ Do not require a hypervisor layer▹ Allow a greater density of containers to run on a host▹ Can be complex, hard to set up, and difficult to
manage and automate▹ Can run the same or a similar guest operating system
as the host machine
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Containerisation
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Hardware virtualization
▹ Large overhead because of hypervisor layer▹ Easy to run and manage▹ Can run any operating system
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Hardware virtualization
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2. Introducing Docker
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Docker is an open-source engine that automates the deployment of applications
into containers.
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”
Docker containers wrap a piece of software in a complete filesystem that
contains everything needed to run: code, runtime, system tools, system
libraries – anything that can be installed on a server. This guarantees that the
software will always run the same, regardless of its environment.
https://www.docker.com/what-docker
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▹ The Docker client and server
▹ Docker Images
▹ Registries
▹ Docker Containers
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Docker components
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Docker architecture
“Images are the building blocks of the Docker world.”https://www.dockerbook.com
Ways to create images:▹ Building an image from a Dockerfile
▹ Updating and committing an image
Docker images16
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Building an image from a Dockerfile
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Building an image from a Dockerfile
$ docker build -t tutorial/nginx .
Updating and committing an image
Run container:$ docker run -t -i training/sinatra /bin/bashInstall what you need:$ root@0b2616b0e5a8:/# apt-get install -y ruby2.0-dev$ root@0b2616b0e5a8:/# gem2.0 install jsonCommit changes:$ docker commit -m "Added json gem" -a "Kate Smith" 0b2616b0e5a8 ouruser/sinatra:v2
https://docs.docker.com/engine/tutorials/dockerimages/
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▹ Docker Hub (public and private repositories)
▹ Own private registry
▹ Hosted private registry
Docker registries20
Run first container21
Container ports magic22
Host OS
8080
Container with Nginx
80
3. Docker in Drupal developmentWhat problems we can solve using it.
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Docker use cases
▹ Use container as a Service
▹ Use container as a tool
▹ Run one host Drupal project with Docker Compose
▹ Run own cloud with Docker Swarm
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Container as a Service(MySQL as an example)
Run:$ docker run -d --name=example-mysql --env="MYSQL_ROOT_PASSWORD=mypassword" mysql
Get IP:$ docker inspect example-mysql
Install Mysql Client:$ apt-get install mysql-client
Profit:$ mysql -uroot -pmypassword -h 172.17.0.20 -P 3306mysql>
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http://severalnines.com/blog/mysql-docker-containers-understanding-basics
Container as a Service(MySQL as an example)26
http://severalnines.com/blog/mysql-docker-containers-understanding-basics
Use container as a tool(PHPUnit as an example)27
https://hub.docker.com/r/phpunit/phpunit/
cd to folder with tests and Run:
$ docker run -v $(pwd):/app --rm phpunit/phpunit run
Profit!▹ No need to install▹ Choose any version▹ Can use different versions for different projects
DEV-STAGE-PROD env with Docker Compose
▹ Compose is a tool for defining and running
multi-container Docker applications.
▹ With Docker Compose, we define a set of
containers to boot up, and their runtime
properties, all defined in a YAML file.
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Exampledocker-compose.yml
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DEV-STAGE-PROD env with Docker ComposeYou should have set of Compose-files for different environments.
▹ docker-compose.yml▹ docker-compose.override.yml▹ docker-compose.dev.yml▹ docker-compose.ci.yml▹ docker-compose.prod.yml
Run site with different commands.
Local:$ docker-compose up -dDev: $ docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d
See more: https://docs.docker.com/compose/extends/
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Own cloud with Docker Swarm mode
▹ Since Docker 1.12 it supports clustering out of the box
▹ It turns a pool of Docker hosts into a single virtual Docker host
More: https://docs.docker.com/engine/swarm/
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By the way!You can forget about server provisioning!
All you need is Docker installed on any Linux distro!
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Questions?
